And let's not forget Von Lengerke and Antoine (VLA), which was Chicago's premier "sporting goods" store for the first several decades of the 20th century, and was where Al Capone and his boys shopped for firearms in Chicago. Apparently you could just walk in and buy a Thompson back in the 20's. Ah, those were the days!
On a related note, I have a Colt .32ACP Pocket Hammerless that was passed down to me from my grandfather via my father, and the Colt letter I have for it shows that it was purchased at VLA in 1923 - not long after Capone moved to Chicago (and presumably wanted something for EDC - he was reputed to have carried a Pocket Hammerless). My grandfather used to travel to Chicago on business in the late 20's and early 30's, and bought the gun used - from someone. :icon_think: